manually update address book (c)

I need someone to manually update and add new entries to an address book. The address book currently consists of roughly 800+ contacts and I need someone to manually go through and make sure the contact information is up-to-date (including address, phone, fax, emails, etc.). I will give you resources to cross-check the entries and you need to make any updates accordingly. Each contact also has associated projects which may also need to be updated. Again I will provide a resource to cross check them. The address book is kept in an excelsheet format which I will give to you. You have to be thorough and accurate - after you update the entries I will go through each entry to verify its accuracy every day. Thanks!